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          Android Jetpack框架
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        <h3 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h3><p><a href="https://developer.android.com/jetpack?hl=zh-cn" target="_blank" rel="noopener">官方文档</a></p>
<p>开源的好处就是可以衍生出很多“项目官方”精力之外的优秀框架，而一些优秀框架就反哺官方团队再次集成优化。 Jetpack就是官方吸收一些优秀的框架的思想, 然后集成到官方版本并再次优化， 继而试图统一规范？<br>刚好我个人的项目还在初期， 所以， 使用Jetpack 来继续接下来的开发，是一举多得。</p>
<h3 id="架构"><a href="#架构" class="headerlink" title="架构"></a>架构</h3><p><img src="https://upload-images.jianshu.io/upload_images/8718569-0eba2b011f653e1c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1200/format/webp" alt=""></p>
<p>jetpack 目前(2021/1/4)为止共有85个控件， 有以前的，有新增的, 分为了Architecture, Foundation, Behavior, UI 四个方向</p>
<p>Architecture<br>    架构相关组件<br>    Lifecycles, 管理Activity和Fragment生命周期<br>    LiveData, 在底层数据库更改时通知视图， 具备生命周期感知能力的数据订阅、分发组件。<br>    ViewModel, 数据存储组件，通常和DataBinding配合使用，我感觉将数据绑定放在xml视图是一个不好的架构，我认为不好的， 我可以不使用。<br>    Room, 轻量级 orm 数据库， GreenDao也是过时的项目了。<br>    DataBinding, view和data之间双向绑定的工具<br>    Paging, 列表分页组件, 可完成一次加载和显示一小块数据。<br>    Navigation, 端内统一路由组件<br>    WorkManager, 管理Android后台作业。</p>
<p>Foundation<br>    基础组件, 提供横向功能： 向后兼容性，测试，安全，Kotlin语言支持<br>    Android KTX, 优化了Kotlin使用Jetpack和Android平台的API<br>    AppCompat, 较低版本系统兼容<br>    Auto, 提供了车辆标准化界面和用户交互<br>    检测, 从AndroidStudio中快速检测基于Kotlin或Java的代码<br>    安全, 安全读写加密文件和共享偏好设置<br>    测试，用于单元和运行时界面测试的Android测试框架<br>    TV, 构建可让用户在大屏幕上体验沉浸式内容的应用的库<br>    Wear OS: 可穿戴设备应用的组件</p>
<p>Behavior<br>    通知，权限，分享<br>    CameraX<br>    DownloadManger<br>    媒体和播放<br>    通知<br>    权限<br>    偏好设置<br>    分享<br>    切片, UI模板<br>UI<br>    动画和过渡<br>    表情符号<br>    Fragment<br>    layout<br>    platte</p>
<h3 id="jetpack库版本查询"><a href="#jetpack库版本查询" class="headerlink" title="jetpack库版本查询"></a>jetpack库版本查询</h3><p><a href="https://developer.android.com/jetpack/androidx/releases" target="_blank" rel="noopener">jetpack releases</a></p>
<p>在上面的库上查询， 到目前为止， 一直保持更新。</p>
<h3 id="学习计划"><a href="#学习计划" class="headerlink" title="学习计划"></a>学习计划</h3><ol>
<li>避开眼高手低的误区</li>
</ol>
<p>上来就给原理搞清楚，学完原理就完成一篇博客。 这个误区叫做眼高手低。<br>先学会用，记录关键信息， 然后再深究原理, 整理成博客。</p>
<ol start="2">
<li>取舍<br>废弃掉基于<a href="https://github.com/Blankj/AndroidUtilCode" target="_blank" rel="noopener">blankj设计的AUC框架</a>搭建的工程，至少对于我个人项目来说, 有些过渡设计。且新版本的AndroidStudio 4.1.1 + gradle 6.5， 需要做一些适配，而我对gradle不熟，暂时对于个人项目来说也没有这个需求。 </li>
</ol>
<p>Android 4.1.1 已经支持了创建模块使用 <code>:</code> 语法多路径创建，这个特性够个人项目的规划使用了。</p>
<ol start="3">
<li><p>从头开始<br>基于Android Studio 4.1.1, gradle6.5, kotlin 1.4.21, jetpack, UI风格完全使用MaterialDesign。<br>学习jetpack库，积累技术，造轮子，分享开源。</p>
</li>
<li><p>后续计划<br>做一个视频sdk, 基于每一个比较大的Android发行版，持续维护, 保持技术学习。</p>
</li>
</ol>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>Jetpack 是google基于各大优秀的开源框架的思想及百家争鸣的现状， 试图统一开发规范而将Android sdk 和 support库整理，删减，新增，优化， 统一重构到andoridx.*库包下,<br>整个Jetpack库贯穿整个应用开发, 可以从四大块方便学习记忆， Architecture, UI, Fundation, Behavior, 相当于新的support 库套件。</p>

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